[U-Boot] [RFC PATCH 0/7] "Transient" (= export-restricted) environment vars

[Joe Hershberger]

Hi Bernhard,

On Mon, Jul 11, 2016 at 1:14 PM, Bernhard Nortmann
<bernhard.nortmann at web.de> wrote:
> This series evolved around the idea of introducing a new env_op
> type to control (and possibly restrict) the export of variables.
> This is especially useful if one wants to prevent dynamic
> configuration information from ending up in a saved environment -
> the 'classic' example being network setup with "dhcp" followed
> by the "saveenv" command.
>
> (The networking case is even further complicated by the fact
> that users may actually wish to setup and save a static IP
> configuration manually, which means that "locking up" the
> corresponding variables right away isn't a viable solution.)
>
> See also:
> http://lists.denx.de/pipermail/u-boot/2015-September/227611.html
> http://lists.denx.de/pipermail/u-boot/2016-April/250237.html

Also see:

http://lists.denx.de/pipermail/u-boot/2010-May/071315.html
http://lists.denx.de/pipermail/u-boot/2010-June/073031.html

> Regards, B. Nortmann
>
> BTW: What the correct 'subsystem'/prefix for the "core" changes
> related to env vars? patman isn't happy with my "env:" choice...

I still use "env:" and just silence patman.

>
> Bernhard Nortmann (7):
>   env: Allow unconditional access if H_PROGRAMMATIC is set
>   net: dm: Ignore unknown env_op_* constants
>   env: Introduce "export" operation and (access flag) restriction
>   env: Introduce "transient" and "system" access flags
>   sunxi: env: flag fel_* environment vars as "system"
>   env: Introduce setenv_transient() helper function
>   env: Automatically mark dynamic configuration info as "do not export"
>
>  cmd/net.c                      | 34 +++++++++++++++++-----------------
>  cmd/nvedit.c                   | 24 +++++++++++++++++++++++-
>  common/env_flags.c             | 21 ++++++++++++++++++---
>  include/common.h               |  1 +
>  include/configs/sunxi-common.h |  8 ++++++++
>  include/env_flags.h            |  5 ++++-
>  include/search.h               |  1 +
>  lib/hashtable.c                |  4 ++++
>  net/eth-uclass.c               |  2 ++
>  9 files changed, 78 insertions(+), 22 deletions(-)
>
> --
> 2.7.3
>
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